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Re: [MW:19931] Re: Welding UNS S31254 to UNS S31254

By Materials & Welding

Dear Mr.Prabhu,

Selection of welding consumables, joint geometry and gas mixture for welding of 254 SMO material depend on various factors.

GTAW may be carried out with ER Ni Cr Mo-3, however niobium free alternative filler metal ER Ni Cr Mo-20       (Nb <0.2) is advisable. It gives a weld metal that is completely free from secondary precipitates. Niobium increases the tendency towards secondary precipitates. In turn, this can lead to hot cracking in the weld metal, however, in environments with high working temperature , ER NiCrMo-3 is a better option because the higher niobium content gives superior structure stability. The ductility of GTAW metals is extremely high.

Welding of, thicker sections of 254 SMO can be carried out by using ER Ni Cr Mo-13, this gives less crack prone weld metal than ER Ni Cr Mo-3 / ER Ni Cr Mo-20.

If the application is for D Stage filter in the CIO₂ bleaching of pulp, here the combination of high temperature, high chlorine levels and an almost neutral pH results in very aggressive environment. Here Nickel based alloys are vulnerable to transpassive corrosion, hence a specially developed iron-based filler metal like P54 is recommended. P54 should not be seen as a replacement for ER-NiCrMo-3 or ER NiCrMo-20, but as a complement for use in extremely demanding environment.

The recommended joint design are as follows.

The shielding gas used should be 100% argon, having a purity of 99.9% argon. Addition of oxygen and carbon dioxide should be avoided for metallurgical reasons. An addition of helium may also be useful under some circumstances.

Hope this clarifies.

Best regards,

Kamal Shah BE,MBA,IWE

National Segment Manager- Oil & Gas Downstream & Pipeline

voestalpine Bohler Welding India Private Limited



On Fri, Jan 17, 2014 at 3:54 PM, Vairamuthu Ramar <vairamuthu78@hotmail.com> wrote:
 
 
 
Could you please explain in detail what type of problem you are facing?
 


 
Date: Thu, 16 Jan 2014 19:55:45 -0800
From: prabhujeetnikam@gmail.com
To: materials-welding@googlegroups.com
Subject: [MW:19876] Re: Welding UNS S31254 to UNS S31254


Dear All,

ER NiCrMo-3 result are dood for lower thickness but for higher thickness i am getting problem. I am welding 10-16 mm thick plates please guide welding parameters for the same.

On Friday, November 15, 2013 3:28:52 PM UTC+5:30, prabhu wrote:
Dear All,

Can you guide me for selecting TIG filler wire for SMO 254  UNS S31254  to  UNS S31254 plate thickness 10mm
and in preparing WPS for same with parameters inputs.

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